Soldering tin, is one of the products from WEEE recycling process. In the past, soldering tin was re-melt to adjust the composition to produce tin alloy ingot. However, the recent requirement given by RoHS (Restriction of Hazardous Substance) request that the soldering tin has to be free of lead for recycling use. To separate lead from soldering tin, Metalcess suggests using a treatment process combining spiral finned crystallizer and vacuum distillation to produce lead-free soldering tin.